Propeller of a vessel



July 7,1931. 1-1. BUHREN PHOPELLER OF A VESSEL INVENTO 19821155 Filed Oct. 25, 1929 fizz/1.. 1W ATTORNEY I Patented July 7, 1931 UNITED STATES PATENT OFFICE HANS IBUHREN, OF BROOKLYN, NEW YORK, ASSIGNOR OF ONE-THIRD TO GEORGE FEDDERSEN AND ONE-THIRD TO J. W. STAMP, OF BROOKLYN, NEW YORK PROPELLER OF A VESSEL Application filed October 25, 1929.

This invention relates to new and useful improvements in propellers, and has for one of its objects to provide a screw-propeller, that on account of its special constructlon Wlll prove very effective as a medium for the creation of a strong actuating power for the propulsion of boats and vessels with the consequent result of obtaining the development of an unequaled rate of speed.

The construction of the device is further to the efi'ect, that the water will be engaged by the blade'of the said propeller in such a manner, or at such an angle to the shaft axis, that even at high speed no objectionable vibration is conveyed to the hull of the craft,

contrary to what is now usually the case under such circumstances. i

It has been a further object of this invention to build a propeller, which will be strong and durable in use, and which conforms to the latest requirements in regard to the technical principles now uniformly recognized in nautical construction.

As the said device is comparatively simple of construction, the cost of manufacturing should be proportionately low.

With the above and other objects in view, this invention consists of the novel features of construction, combination and arrangements of parts, hereinafter fully described, claimed, and illustrated in the accompanying drawings forming parts of this specification, and in which similar characters of reference indicate corresponding parts in all views, and in which:

Figure 1 shows the propeller attached to a boat; Figure 2 is a face view of my device looking towards the hub; Figure 3 is a side elevational View; Figure 4 is a view similar to Figure 3, but with the propeller turned in a clock-wise manner to a position of degrees to the former; and Figure 5 is a transverse sectional view taken on line 5-5 of Figure 2.

Referring more particularly to the drawings, 10 indicates my propeller, which consists of but one blade, made in one piece, specially formed and peculiarly twisted.

The said blade is integrally mounted on a Serial No. 402,396.

hub 11, adaptedto receive the usual shaft or axle.

As will be observed in Figure 3, the said propeller has one portion thereof arranged with respect to the hub in an almost straight manner, or with a comparatively small deviation fromthe perpendicular, whereas the opposite portion 13 has been formed with a conspicuously twisted bend, which places this portion, relatively to the hub, in a position of about 45 degrees to the perpendicular.

The portion 12 ofthe blade is therefore adapted to e the water in a true helix; but the blade portion l3because of the pronounced rearward flare which occurs at the point of about two thirds of its circumferencese'e Figure 3 and in Figure 4 in the direction of the arrowcuts the water with a greater horizontal resistance and exerts a driving force so directed as to bring the vor-- tex closer to the axis of the propeller. This characteristic greatly lessens the vibration at high speed and thus provides for increased stability and steadiness of the hull of the vessel.

In order to impart suflicient strength to the said propeller, that it may safely withstand the strain incidental to a high potential revolution, the blade of the latter has been formed in a tapered manner, in roportion of about one to five, the said bla e having its greatest-thickness near its center, as shown in Figure 5.

For the purpose of further strengthening the said construction of the blade, the latter has been integrally formed upon one side with a reenforcement, or fillet, 15, near its center, as shown in Figure 5.

It is obvious that changes may be made in the form, construction and arrangement of the several parts, as shown, within the scope of the appended claims, without departing from the spirit of the invention, and I do not therefore limit myself to the construction and arrangement shown and described herein.

What-I claim as new, and desire to secure by Letters Patent of the United States, is:

1."A propeller of the character described, comprising a continuous blade element integral with a concentric hub, and the said blade so formed that, from its forward end it follows the line of a true helix up to that portion substantially positioned at two thirds of its circumference and from this point is 5 flared sharply in a rearward direction.

2. A propeller of the character described, and the said propeller constructed with one continuous blade integral with a concentric hub and disposed in a true helix for the ma- 'jor portion of its circumference, and in the remaining portion offset rearwardly at an angle of deflection greater than the aforesaid helix of the ma or portion.

3. A propeller of the character described,

the said propeller comprising a single blade element mounted on a concentric hub, and the said blade element describing a spiral course of uniform deflection for the major portion of its circumference and having the remaining portion overlapping the marginal line of its opposite end and oil'set from the true spiral course characteristic of the major portion of the said blade.

41-. A propeller blade mounted on a hub member, and the said blade spiral in formation and having an inwardly curved marginal edge on its forward portion and an oppositely curved marginal edge on its rearward portion, and the rearward portion of the blade flared in the direction of its horizontal axis and at a greater degree of deflection than that of the major portion of the said blade.

Signed at New York city in the county of 5 New York and State of New York this 21st day of October A. D. 1929.

HANS BUHREN. 

